C 2500 Yukon XL 2WD V8-6.0L VIN U (2001)
Body Control Module: Description and Operation
Wake-Up State
The BCM performs the BCM functions in the wake-up state. The BCM enters the sleep state when the active control or monitoring of system
malfunctions has stopped, or when the BCM is idling. The BCM must detect certain wake-up inputs before entering the wake-up state. The BCM
monitors the BCM inputs during the sleep state, allowing the BCM to switch between the 2 states. The BCM wake-ups are as follows:
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Door ajar switches
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Door handle switches
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Dome lamp
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Park lamps
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Power door lock switches
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Interior lamp request active
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Ignition key put into the ignition switch
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Ignition key removed from the ignition switch
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Ignition in the RUN position
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Key in door lock switch
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RFA request to the BCM
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Any Class 2 communication requiring BCM interaction